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  1. All Contests
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  3. Project Euler #1: Multiples of 3 and 5
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Project Euler #1: Multiples of 3 and 5

  • vizzy205
     + 0 comments
    import sys
t = int(input().strip())
for a0 in range(t):
    n = int(input().strip())
    three=(n-1)//3
    five=(n-1)//5
    fifteen=(n-1)//15
    print((3*(three*(three+1)//2)+5*(five*(five+1)//2)-15*(fifteen*(fifteen+1)//2)))